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Mc-flyin is the act of getting really high when smoking weed and going to Mcdonalds to satisfy your munchies.

Most pot-heads go through the drive-through window due to fear of police officers
Josh-"Yo Darrel where you at right now?"

Darrel- "yo i just hit a blunt and now im Mc-Flyin.. you want me to pick you up anything?"
by Ace Nations August 10, 2009
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